In the northwestern part of the island of Tongatapu lies the historic site of Ha'amonga 'a Maui Trilithon. Locals often call it the Stonehenge Pacific. Three megalithic limestone stones form the 5,2-meter-high gate. Archeologists believe that this gate was built at the beginning of the 13th century and that it led to the royal palace. Nearby is a stone throne called ʻEsi Maka Faakinanga, which was believed to make the king safe from attack when he leaned his back on it. Visitors point out the fantastic view that extends from this place to almost the entire island.